The Focusrite Scarlett 18i8 of the second generation is an USB audio interface with 18 In- and 8 Outputs among them are 4 analog Inputs with 4 Scarlett mic preamps, MIDI I/O, S/PDIF I/O, 2 headphone Outputs with individual level control, 4 analog Line Outputs, 8 Line Inputs and an optical ADAT Input.